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run a ps2 on a 9v battery? Answered

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The potential is there, for the voltage at least. A rather large bank of 9 volt batteries in parallel could potentially run a PS2, but an induvidual one? No chance. It's a matter of current drain. The PS2 may run on 8.5V, but notice the power adapter also outputs at 5.65amps? A single 9volt cell would have, on average, around 450mAH or so.
So while you have the voltage there, there's nowhere near enough power.